Attachments only including a single line during hard crashes

[MattJustMatt]

Platform

iOS

Environment

Production

Installed

CocoaPods

Version

8.44

Xcode Version

16

Did it work on previous versions?

No response

Steps to Reproduce

    void Platform_Interop::sentry_init() {
        String platform = "apple";
        String realm = "client";
        String release = tprint("%-%@%", platform, realm, AO_COMMIT_HASH);
        NSString *ns_release = [NSString stringWithUTF8String:to_c_string(TEMP(), STACK_TRACE_NODE, release)];
        
        NSNumber *sampleRate = [NSNumber numberWithDouble:0.1];
        NSNumber *sampleRateError = [NSNumber numberWithDouble:1.0];
        
        [SentrySDK startWithConfigureOptions:^(SentryOptions *options) {
            options.dsn = @"xxx";
            options.attachViewHierarchy = NO;
            options.enableMetricKit = NO;
            options.enableTimeToFullDisplayTracing = NO;
            options.swiftAsyncStacktraces = YES;
            options.sampleRate = sampleRateError;
            options.tracesSampleRate = sampleRate;
            options.releaseName = ns_release;
            options.enablePersistingTracesWhenCrashing = YES;
        }];

        String session_file_path = tprint("%/LOG-Client.txt", Platform_Interop::get_writable_directory(TEMP()));

        FILE *f = freopen((const char *)session_file_path.data, "r", stdout);
        if (f == NULL) {
            f = freopen((const char *)session_file_path.data, "w+b", stdout);
        }
        if (f != NULL) {
            fclose(f);
        }

        NSString *ns_session_file_path = [NSString stringWithUTF8String:to_c_string(TEMP(), STACK_TRACE_NODE, session_file_path)];
        SentryAttachment *fileAttachment = [[SentryAttachment alloc] initWithPath: ns_session_file_path];
        [SentrySDK configureScope:^(SentryScope *_Nonnull scope) {
            [scope addAttachment:fileAttachment];
        }];
    }

Exceptions captured normally with capture_event include the full session log, but if the application exits with a sigsegv or otherwise, the log only contains a single line.

We tried moving the init prior to clearing the session log on start in case hard crashes were being sent on next startup but this didn't appear to work either.

Example event: https://all-out-fb.sentry.io/issues/6274834837/events/oldest/attachments/?project=4505228624396288&query=is%3Aunresolved%20issue.priority%3A%5Bhigh%2C%20medium%5D&referrer=oldest-event&statsPeriod=10m&stream_index=0

Expected Result

Full session log attachment same as when calling capture event normally

Actual Result

Single line log

Are you willing to submit a PR?

No response

[philipphofmann]

We don't support attachments for crashes yet; see https://docs.sentry.io/platforms/apple/guides/ios/enriching-events/attachments/#uploading-attachments.

You will be able to do this by adding attachments in beforeSend (#1460), which would also work for crashes and we haven't tackled yet. I can't give you an ETA for this feature.

You can consider adding your info to breadcrumbs, which work for crashes. I'm closing this as duplicate of #1460.